Getting extended BIOS memory address

[zen]

Hi,

I want to find the address of extended BIOS memry address. This is done using INT 15/AX=0e820h in DOS(real mode) but I want this functinality in VC++(protected mode) which doesent support this function. even I tried writing device driver for executing kernel mode instruction but my system is crashing. So can any body help me with this.

Thanks.